|
Cash, Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)
|
Sep. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | $ 12,617,082 | $ 23,535,756 |
| Gross Unrealized Gains | 26,762 | 42,826 |
| Gross Unrealized Losses | (5,148) | (2,859) |
| Fair Value | 12,638,696 | 23,575,723 |
| Cash Equivalents | 1,548,267 | 5,497,788 |
| Short-Term Investments | 8,113,687 | 12,701,538 |
| Long-Term Investments | 2,976,742 | 5,376,397 |
|
Cash And Cash Equivalents [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 1,548,267 | 5,497,788 |
| Fair Value | 1,548,267 | 5,497,788 |
| Cash Equivalents | 1,548,267 | 5,497,788 |
|
Cash And Cash Equivalents [Member] | Money Market Funds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 1,548,267 | 5,497,788 |
| Fair Value | 1,548,267 | 5,497,788 |
| Cash Equivalents | 1,548,267 | 5,497,788 |
|
Investments [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 11,068,815 | 18,037,968 |
| Gross Unrealized Gains | 26,762 | 42,826 |
| Gross Unrealized Losses | (5,148) | (2,859) |
| Fair Value | 11,090,429 | 18,077,935 |
| Short-Term Investments | 8,113,687 | 12,701,538 |
| Long-Term Investments | 2,976,742 | 5,376,397 |
|
Investments [Member] | Certificates Of Deposit [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 2,101,926 | 8,157,749 |
| Gross Unrealized Gains | 785 | 3,727 |
| Gross Unrealized Losses | (2,213) | (1,945) |
| Fair Value | 2,100,498 | 8,159,531 |
| Short-Term Investments | 1,861,509 | 7,258,768 |
| Long-Term Investments | 238,989 | 900,763 |
|
Investments [Member] | Corporate Notes And Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 8,966,889 | 8,241,327 |
| Gross Unrealized Gains | 25,977 | 35,364 |
| Gross Unrealized Losses | (2,935) | (914) |
| Fair Value | 8,989,931 | 8,275,777 |
| Short-Term Investments | 6,252,178 | 3,800,143 |
| Long-Term Investments | 2,737,753 | 4,475,634 |
|
Investments [Member] | Commercial Paper [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Amortized Cost | 1,638,892 | |
| Gross Unrealized Gains | 3,735 | |
| Fair Value | 1,642,627 | |
| Short-Term Investments | $ 1,642,627 |